Ipswich City Council's Springfield-based councillor David Morrison welcomed the change but said the extra lanes had come at a cost.

"It has come at a cost, but I think the community understands the cost," Cr Morrison said.

"The cost is the bikeway that was originally announced will be dropped."

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Cr Morrison said he had spoken to cyclists who were looking forward to riding to work into Brisbane, when the new cycleway joined the existing Centenary Bikeway.

"They were excited when it was first announced, but now they are disappointed," he said.

"So my plea to the state government is not to forget about the cyclists; try to include it in a future budget."

Cr Morrison also questioned the number of car parks proposed for the new Springfield Central train station.

While Richlands has 650 car spaces, only 100 spaces are recommended for Springfield Central.

"On a weekday, those 650 car spaces are filled by 8.30am and that's been the case for some time," he said.

Cr Morrison urged a rethink on the size of the car park at the Springfield Central station.

"My call to the state government is that this station is going to be world class, with an elevated platform, escalators, everything you could wish for," he said.

"But the experience is going to be frustrating for the commuter because they are not going to be able to find a car park."

Cr Morrison urged the state government to discuss the issue with land owner Springfield Land Corporation to broker an "overflow" space for extra car parking.

The extra road lanes are part of the second stage ($475 million) of the bigger Darra to Springfield Transport Corridor Project to build a rail line to Springfield.

In the first stage ($800 million), the rail line was extended to Richlands and the highway widened to four lanes to Richlands.

Mr Emerson told a Chamber of Commerce meeting at Springfield today that after reviewing the project, the government had decided the two extra highway lanes could be added.

“There are more than 5000 motorists who travel along the Centenary Highway in the morning and afternoon peaks, and these commuters know how desperately the upgrade is needed to ease the mounting traffic congestion," he said.

The original aim of the major project is to improve transport access to residential areas at Springfield, one of the designated population growth areas in Brisbane's "western corridor".

The cost of covering the extra highway lanes will come from axing the bikeways and walking paths and deciding not to go ahead with lowering one of the bridges.

"They will be considered later, as the population grows," a spokesman for Mr Emerson said.

The project now includes:

Widening the existing southbound single lane from the Logan Motorway interchange to the Springfield Parkway to two southbound lanes.

Building two northbound lanes from the Springfield Parkway to Johnson Road at Greenbank.

A new on-ramp to be built from Logan Motorway west to the Centenary Highway.

Three new bridges over the Logan Motorway Interchange, Johnson Road and Sandy Creek.

The highway is scheduled to be finished in 2014, and the 9.5-kilometre rail line will be finished by 2013.